Integrated microfiltration device applied to arsenic-phosphorus wastewater treatment

Abstract

The utility model discloses an integrated microfiltration device applied to arsenic phosphorus wastewater treatment, which comprises a microfiltration pipeline, the microfiltration pipeline comprises a water inlet and a water outlet, the water inlet is connected with a concentration tank through a first water pump, and feed liquid flowing out of the water outlet flows back to the concentration tank; the microfiltration pipeline comprises a plurality of microfiltration pipes which are connected with one another, microfiltration membrane pipes are mounted in the microfiltration pipes, an annular gap part is formed between the microfiltration pipes and the microfiltration membrane pipes, and the two ends of the gap part are closed; the device further comprises a drainage pipeline, and the microfiltration pipes are connected with the drainage pipeline and used for discharging filtered feed liquid. Feed liquid in the concentration tank is pumped into the water inlet by the water pump and flows through the inner surface of the micro-filtration membrane pipe, solid particles are intercepted by the micro-filtration membrane pipe, the feed liquid flows out of the micro-filtration membrane pipe, enters the drainage pipeline and can be directly discharged, the intercepted solid particles flow along with the feed liquid until the solid particles are discharged from the water outlet and flow back into the concentration tank, and the operation is continuously repeated. And after the concentration of the feed liquid in the concentration tank reaches the standard, carrying out filter pressing treatment by using a filter press.

Description

Technical Field

[0001] The utility model relates to the field of wastewater treatment equipment, in particular to an integrated microfiltration device applied to the treatment of arsenic and phosphorus wastewater. Background Art

[0002] Arsenic-containing and phosphorus-containing wastewater poses great hazards to the environment and human body. Arsenic is a first-class pollutant, and arsenic and its compounds are carcinogenic substances with high toxicity. Once arsenic pollutes water bodies and soil, it will enter the human body through the food chain or surface water and groundwater, endangering human health. Phosphorus is a second-class pollutant. If the phosphorus content in water exceeds 20mg / L, it will cause eutrophication of water bodies, resulting in a large number of algae breeding. After the death of algal bodies, decomposition will cause the water body to produce musty and stinky smells, affecting the survival of aquatic organisms such as fish.

[0003] At present, the treatment of arsenic in arsenic and phosphorus wastewater is mainly carried out by coagulation precipitation through the lime ferric salt method. Since arsenic is a type of pollutant, strict control of emissions is required. However, in the existing conventional coagulation precipitation process, due to solubility, the reverse dissolution phenomenon will occur when the solid substance reaches saturation in the solvent, so the single-stage removal rate is limited. Therefore, usually secondary or even tertiary precipitation is required to meet the discharge standards.

[0004] This often occupies more space in the wastewater treatment station, with a large amount of chemical agents used, a large amount of sludge produced, and complex maintenance. Content of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model aims to provide an integrated microfiltration device applied to the treatment of arsenic and phosphorus wastewater to solve the problems that the existing arsenic and phosphorus wastewater needs multi-stage precipitation to meet the standards, resulting in increased costs and complex maintenance. The specific technical solutions are as follows:

[0006] An integrated microfiltration device applied to the treatment of arsenic and phosphorus wastewater includes a microfiltration pipeline connected by several pipelines. The microfiltration pipeline includes a water inlet and a water outlet. Among them, the water inlet is connected to a concentration tank containing arsenic and phosphorus wastewater through a first water pump, and the liquid discharged from the water outlet flows back to the concentration tank;

[0007] The microfiltration pipeline includes several interconnected microfiltration tubes. A microfiltration membrane tube is installed in each microfiltration tube, and an annular gap is formed between the microfiltration tube and the microfiltration membrane tube. Both ends of the gap are closed;

[0008] It also includes a drainage pipeline. Several microfiltration tubes are all connected to the drainage pipeline for discharging the liquid filtered by the microfiltration membrane tube.

[0009] As a preferred implementation method: the microfiltration pipeline is arranged in an S shape, and several microfiltration tubes are all horizontally arranged.

[0010] As a preferred embodiment: The microfiltration tubes in the microfiltration pipeline are arranged in several rows, and each microfiltration tube in each row is connected by a copy link clamp.

[0011] As a preferred embodiment: It further includes an emptying pipe. Each row of microfiltration tubes and the drainage pipeline are connected to the emptying pipe. An electromagnetic valve is arranged in the emptying pipe, and the position of the discharge port of the emptying pipe is lower than the microfiltration pipeline and the drainage pipeline.

[0012] As a preferred embodiment: There are multiple sets of the shown microfiltration pipelines. The sets of microfiltration pipelines are arranged side by side and fixedly installed on a bracket.

[0013] As a preferred embodiment: An exhaust valve is further arranged on the drainage pipeline.

[0014] As a preferred embodiment: A rotameter is further arranged in the drainage pipeline.

[0015] As a preferred embodiment: A turbidimeter is arranged in the thickening tank.

[0016] As a preferred embodiment: It further includes a backwashing pipeline. One end of the backwashing pipeline is connected to a water source through a second water pump, and the other end is connected to the drainage pipeline.

[0017] As a preferred embodiment: It further includes a chemical washing pipeline. One end of the chemical washing pipeline is provided with a chemical addition port. One end of the chemical washing pipeline is connected to a chemical source through a third water pump, and the other end is connected to the microfiltration pipeline.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] In the present utility model, a number of microfiltration tubes are arranged in the microfiltration pipeline. A microfiltration membrane tube is installed inside the microfiltration tube, and the microfiltration tube is connected to the drainage pipe. The liquid in the thickening tank is pumped into the water inlet by a water pump. The liquid flows through the inner surface of the microfiltration membrane tube. The microfiltration membrane tube intercepts solid particles. The liquid flows out of the microfiltration membrane tube and enters the drainage pipeline and can be directly discharged. The intercepted solid particles continue to flow with the liquid under the drive of pressure to the next microfiltration tube until they are discharged from the water outlet and flow back into the thickening tank. The above process is continuously repeated until the concentration of the liquid in the thickening tank reaches a certain standard and then is subjected to pressure filtration treatment by a filter press. Description of the Drawings

[0020] Figure 1 is the pipeline connection diagram of the overall structure of the present utility model;

[0021] Figure 2 is the cross-sectional view of the microfiltration tube structure in the present utility model;

[0022] In the figure, 1 is the water inlet; 2 is the water outlet; 3 is the microfiltration tube; 4 is the microfiltration membrane tube; 5 is the clearance part; 6 is the drainage pipeline; 60 is the connecting pipe; 7 is the emptying pipe; 8 is the exhaust valve; 9 is the backwashing pipeline; 10 is the chemical washing pipeline. Specific embodiments

[0023] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0024] The following uses specific specific examples to illustrate the implementation manners of the present disclosure. Those skilled in the art can easily understand other advantages and effects of the present disclosure from the content disclosed in this specification. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The present disclosure can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts belong to the scope protected by the present disclosure.

[0025] Embodiment 1

[0026] In the process of treating arsenic and phosphorus wastewater, FeCl3 and Ca(OH)2 can be prepared into an aqueous solution and an emulsion and added to the arsenic and phosphorus wastewater reaction tank. At this time, arsenate will react to form a precipitate. Under the bridging action of iron ions, the precipitate forms a flocculent precipitate with a larger volume. Then, CaCl2 is added to further remove arsenic and phosphorus. Since the separation particle size of the integrated microfiltration membrane device is 5 microns, it is not necessary to perform mud-water separation through a sedimentation tank, so it is not necessary to add PAM medicament as an auxiliary. The reacted arsenic and phosphorus wastewater enters the concentration tank and is then filtered by the integrated microfiltration device disclosed in this embodiment, so as to meet the discharge requirements.

[0027] As Figure 1 and Figure 2 shown, an integrated microfiltration device applied to the treatment of arsenic and phosphorus wastewater includes a microfiltration pipeline connected by a plurality of pipelines. The microfiltration pipeline includes a water inlet 1 and a water outlet 2. Among them, the water inlet 1 is connected to the concentration tank containing arsenic and phosphorus wastewater through a first water pump. After the liquid in the concentration tank is pumped into the microfiltration pipeline by the first water pump, it is filtered by the microfiltration pipe 3, and the filtered liquid directly enters the drainage pipeline 6 through the connecting pipe 60.

[0028] The microfiltration pipeline includes a plurality of interconnected microfiltration tubes 3. The microfiltration tube path is arranged in an S shape and is installed on a bracket. The microfiltration tubes 3 are horizontally arranged and arranged in several rows. Each row contains a plurality of microfiltration tubes 3. The microfiltration tubes 3 in the same row are connected by a copy link clamp.

[0029] As Figure 2 shown, a microfiltration membrane tube 4 is installed inside the microfiltration tube 3. An annular gap portion 5 is formed between the microfiltration membrane tube 4 and the microfiltration tube 3, and both ends of the gap portion 5 are closed, so that the feed liquid cannot directly flow in from the ends of the gap portion 5. The feed liquid is filtered by the microfiltration membrane tube 4, and the solid particles are intercepted inside the microfiltration membrane tube 4. Part of the feed liquid continues to flow in the microfiltration pipeline, and the other part of the feed liquid flows through the microfiltration membrane tube 4 into the gap portion 5. Each microfiltration tube 3 is connected to a drainage pipeline 6 through a connecting pipe 60. The feed liquid in the gap portion 5 flows into the drainage pipeline 6 through the connecting pipe 60 and reaches the discharge standard, and can be directly discharged. A rotameter is also arranged in the drainage pipeline 6 to monitor the flow condition in the drainage pipeline 6, so as to adjust the power of the first water pump according to the actual situation.

[0030] The intercepted solid particles continue to flow in the microfiltration pipeline along with the feed liquid, and finally are discharged from the drain port 2 and returned to the concentration tank for the next round of filtration. In this way, the concentration of the feed liquid in the concentration tank gradually increases. The concentration of the feed liquid in the concentration tank can be increased by calculating the number of cycles or time, or by setting a turbidimeter in the concentration tank. When the concentration of the feed liquid in the concentration tank reaches a certain standard, a filter press is used for pressure filtration treatment.

[0031] The microfiltration pipeline is also connected with an emptying pipe 7. Each row of microfiltration tubes 3 and the drainage pipeline 6 are connected to the emptying pipe 7. An electromagnetic valve is arranged in the emptying pipe 7, and the position of the discharge port 70 of the emptying pipe 7 is lower than the microfiltration pipeline and the drainage pipeline 6. When the filtration of the feed liquid is completed and the feed liquid in the microfiltration pipeline and the drainage pipeline 6 needs to be drained completely, the electromagnetic valve in the emptying pipe 7 can be opened at this time, and the remaining feed liquid in the microfiltration pipeline and the drainage pipeline 6 is discharged from the emptying pipe 7. At the same time, an exhaust valve 8 is also arranged on the drainage pipeline 6. The exhaust valve 8 is used to communicate with the external air to timely discharge the gas in the drainage pipeline 6 and prevent the occurrence of siphon phenomenon.

[0032] In this embodiment, the feed liquid flows through the inner surface of the membrane tube under the drive of pressure, and the solid particles of the intercepted substances are carried out of the membrane tube by the concentrated liquid and will not accumulate on the membrane surface to cause fouling. This filtration mode is also called cross-flow filtration. In the cross-flow filtration mode, the feed liquid filters the membrane surface in a tangential flow. This design makes the liquid on the membrane surface form a turbulent state, thereby preventing the accumulation of particulate matter into a cake layer.

[0033] In addition, the microfiltration device of this embodiment is also provided with a backwashing pipeline 9 and a chemical washing pipeline 10, both of which are used to clean the solid particles remaining on the inner wall of the microfiltration membrane tube 4. Specifically, one end of the backwashing pipeline 9 is connected to a water source through a second water pump. This water source can be the filtered feed liquid discharged from the backwashing pipeline 9 or other clean water sources. Close the electromagnetic valves of the microfiltration pipeline leading to the water inlet 1 and the water outlet 2, and open the electromagnetic valve of the drain pipe 7 to prevent the liquid from flowing into the concentration tank. The liquid enters the connecting pipe 60 through the drainage pipeline 6 and enters the gap part 5 in each microfiltration tube 3, flushing from the outside to the tube wall of the microfiltration membrane tube 4, washing away the solid particles on the inner wall of the microfiltration membrane tube 4, and discharging them from the drain pipe 7.

[0034] Among them, one end of the chemical washing pipeline 10 is provided with a chemical addition port, which can react with the solid particles on the inner wall of the microfiltration membrane tube 4. One end of the chemical washing pipeline 10 is connected to a chemical source through a third water pump, and the other end is connected to the microfiltration pipeline. Close the electromagnetic valve of the microfiltration pipeline leading to the drain pipe 7, so that the solid particles remaining on the inner wall of the microfiltration membrane tube 4 react and are filtered by the microfiltration membrane tube 4. Part of them enters the drainage pipeline 6, and the other part follows the liquid and is discharged from the water outlet 2 and flows back into the concentration tank.

[0035] In this embodiment, multiple sets of microfiltration pipelines are provided. The multiple sets of microfiltration pipelines are arranged side by side and fixedly installed on the bracket, so that multiple microfiltration pipelines can filter simultaneously, improving the filtration efficiency. Among them, the water inlet 1 of each set of microfiltration pipelines is connected with a first water pump. The backwashing pipelines in multiple sets of microfiltration pipelines share a second water pump, and the chemical washing pipelines in multiple sets of microfiltration pipelines share a third water pump. By controlling the connection of the second water pump and the third water pump to each pipeline through electromagnetic valves, the cost can be effectively saved.

[0036] This utility model utilizes the characteristics of the microfiltration membrane, and the feed liquid can reach the discharge standard through primary sedimentation. The remaining feed liquid flows back into the concentration tank from the water outlet 2, and circulates continuously like this until the concentration of the feed liquid in the concentration tank reaches a certain standard, and then it is processed by a filter press. The whole process can complete the filtration cycle automatically without manual intervention, and also improves the treatment efficiency of arsenic and phosphorus wastewater, effectively saving the treatment cost of arsenic and phosphorus wastewater and simplifying the process, and is suitable for popularization and use.

[0037] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by the terms "middle", "length", "upper", "lower", "front", "rear", "vertical", "horizontal", "inner", "outer", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this utility model.

[0038] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. The meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] In the present utility model, unless otherwise clearly specified and defined, the terms "mounted", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] The above is only to illustrate the embodiments of the present utility model and is not intended to limit the present utility model. For those skilled in the art, any modifications, equivalent replacements, improvements, etc. made without creative efforts within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An integrated microfiltration device applied to the treatment of arsenic and phosphorus wastewater, comprising a microfiltration pipeline formed by connecting a number of pipelines to each other, characterized in that: The microfiltration pipeline includes a water inlet (1) and a water outlet (2). Among them, the water inlet (1) is connected to a concentration tank containing arsenic and phosphorus wastewater through a first water pump, and the liquid discharged from the water outlet (2) flows back into the concentration tank; The microfiltration pipeline includes a number of interconnected microfiltration tubes (3). A microfiltration membrane tube (4) is installed in each microfiltration tube (3). An annular gap portion (5) is formed between the microfiltration tube (3) and the microfiltration membrane tube (4), and both ends of the gap portion (5) are closed; It also includes a drainage pipeline (6). A number of microfiltration tubes (3) are all connected to the drainage pipeline (6) for discharging the liquid filtered by the microfiltration membrane tube (4).

2. The integrated microfiltration device applied to the treatment of arsenic and phosphorus wastewater according to claim 1, characterized in that: The microfiltration pipeline is arranged in an S shape, and a number of microfiltration tubes (3) are all horizontally arranged.

3. The integrated microfiltration device applied to the treatment of arsenic and phosphorus wastewater according to claim 2, wherein: The microfiltration tubes (3) in the microfiltration pipeline are arranged in several rows, and the microfiltration tubes (3) in each row are connected by copy link clamps.

4. The integrated microfiltration device applied to the treatment of arsenic and phosphorus wastewater according to claim 3, wherein: It also includes an emptying pipe (7). Each row of microfiltration tubes (3) and the drainage pipeline (6) are all connected to the emptying pipe (7). An electromagnetic valve is arranged in the emptying pipe (7), and the position of the discharge port of the emptying pipe (7) is lower than that of the microfiltration pipeline and the drainage pipeline (6).

5. The integrated microfiltration device applied to arsenic and phosphorus wastewater treatment according to claim 1, characterized in that: Multiple sets of the shown microfiltration pipelines are provided. The multiple sets of microfiltration pipelines are arranged side by side and fixedly installed on a bracket.

6. The integrated microfiltration device applied to arsenic and phosphorus wastewater treatment according to claim 1, characterized in that: An exhaust valve (8) is also arranged on the drainage pipeline (6).

7. The integrated microfiltration device applied to arsenic and phosphorus wastewater treatment according to claim 1, characterized in that: A rotameter is also arranged in the drainage pipeline (6).

8. The integrated microfiltration device applied to arsenic and phosphorus wastewater treatment according to claim 1, characterized in that: A turbidimeter is arranged in the concentration tank.

9. The integrated microfiltration device applied to the treatment of arsenic and phosphorus wastewater according to any one of claims 1-8, characterized in that: It also includes a backwashing pipeline (9). One end of the backwashing pipeline (9) is connected to a water source through a second water pump, and the other end is connected to the drainage pipeline (6).

10. The integrated microfiltration device applied to arsenic and phosphorus wastewater treatment according to any one of claims 1-8, characterized in that: It also includes a chemical washing pipeline (10). One end of the chemical washing pipeline (10) is provided with a chemical addition port. One end of the chemical washing pipeline (10) is connected to a chemical source through a third water pump, and the other end is connected to the microfiltration pipeline.

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